Wall base



FIG. 1 is a front, top, right side perspective view of a wall base showing my new design.

FIG. 2 is a right side view, the left side view being a mirror image thereof;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view

FIG. 5 is a bottom plan view; and,

FIG. 6 is a front, top, right side perspective view thereof.

The evenly dash-dash broken lines showing of small circles, in FIGS. 1, 4, and 6 depict portions of the wall base that form no part of the claimed design. The long-short dash lines, in FIG. 6, depict environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a wall base, as shown and described. 